Engine directory for ticket #1

Engine/source/platformWin32/winMath_ASM.cpp

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+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#include "math/mMath.h"
+
+#if defined(TORQUE_SUPPORTS_VC_INLINE_X86_ASM)
+static S32 m_mulDivS32_ASM(S32 a, S32 b, S32 c)
+{  // a * b / c
+   S32 r;
+   _asm
+   {
+      mov   eax, a
+      imul  b
+      idiv  c
+      mov   r, eax
+   }
+   return r;
+}
+
+
+static U32 m_mulDivU32_ASM(S32 a, S32 b, U32 c)
+{  // a * b / c
+   S32 r;
+   _asm
+   {
+      mov   eax, a
+      mov   edx, 0
+      mul   b
+      div   c
+      mov   r, eax
+   }
+   return r;
+}
+
+static void m_sincos_ASM( F32 angle, F32 *s, F32 *c )
+{
+   _asm
+   {
+      fld     angle
+      fsincos
+      mov     eax, c
+      fstp    dword ptr [eax]
+      mov     eax, s
+      fstp    dword ptr [eax]
+   }
+}
+
+U32 Platform::getMathControlState()
+{
+   U16 cw;
+   _asm
+   {
+      fstcw cw
+   }
+   return cw;
+}
+
+void Platform::setMathControlState(U32 state)
+{
+   U16 cw = state;
+   _asm
+   {
+      fldcw cw
+   }
+}
+
+void Platform::setMathControlStateKnown()
+{
+   U16 cw = 0x27F;
+   _asm
+   {
+      fldcw cw
+   }
+}
+
+
+#endif
+
+//------------------------------------------------------------------------------
+void mInstallLibrary_ASM()
+{
+#if defined(TORQUE_SUPPORTS_VC_INLINE_X86_ASM)
+   m_mulDivS32              = m_mulDivS32_ASM;
+   m_mulDivU32              = m_mulDivU32_ASM;
+   
+   m_sincos = m_sincos_ASM;
+#endif
+}
+
+